Most Institutes and Organization use performance appraisal system to evaluate the teachers performance. The teachers performance is very important to the students and as well as school management, in which usually involves crisp and uncertain values to evaluate teacher’s performance. In this paper we proposed to evaluate teachers performance on the basis of different factors, applying into fuzzy inference system (FIS) , FIS is the process of formulating the mapping from a given input to an output using fuzzy logic. We can consider some of the most relevant factors, and developed rules will be fuzzified. As input fuzzy variable performance will be fuzzified with suitable fuzzy linguistic variable and ultimately FIS will be developed. This paper explains the comparison of two different membership function and getting more or less similar, So as to achieve the shape of membership function, which is not playing much role to evaluate the performance in positive or negative direction.
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